/Engine/Source/Editor/LevelEditor/Public/LevelEditor.h
Gets the extensibility managers for outside entities to extend static mesh editor's menus and toolbars
virtual [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FExtensibilityManager](API\Editor\UnrealEd\Toolkits\FExtensibilityManager) > GetMenuExtensibilityManager()